Primary battery



April 9, 1935. F. KILLIAN PRIMARY BATTERY Filed May 29, 1933 m m r U c 6 mm re nn m a m z n n u u m I nvento'f flanz E 71323271 M V Attorney Patent ed I Apr. 9, 1935 UNITED STATES. PATENT OFFICE I PRIMARY ATT RY Franz Killiamfloboken, N. J; Application May 29,1933, Serial'No. 673,563

1 Claim. (c1. 136- 107) The main object of this invention is the provision of an improvement in dry cells whereby the effective electrical life of such cells is substan-" 15 parent in the description below, in which characters of reference refer to like-named the drawing. v i

Referring briefly to the drawing, Figure 1 is a vertical section through so-c'alled'No. 6 dry cell, showing the improvement embodied inthe present invention.

parts a in Figure 2 is a similar view, showing the improvement applied to a flashlight dry cell. Figure 3 is a cross-sectional view-taken on the 25. line3--3ofFigure2. 5' Referring briefly to the drawing, the numeral III represents a No. 6 dry cell, and the numeral II a flashlight dry cell. Vertically downward to the cardboard bottom. washer or disk I 2, the con- 33 struction of the cells is standard. The lower surface of the washer I2 is coated with electrolytic excitant jelly IS. The bottom I6 of the can in and II is also coated with excitant jelly IS. The space between these two parts is filled'with a 35 layer of chemically pure powdered zinc l4.

- Experiments have proved conclusively that the "addition of the powdered zinc layer l4 after the bottom of the washer l2 and the bottom I 6 of the can have been coated with excitant jelly, in-

- 40 creased the intermittent service life of the flashlight sack cells by a minimum of thirty-five percent. The standard 1%inch by 2% inch flashlight cells experimented' with gave an intermitflashlight cells, that is, those not the .the layers of the excitant Jelly. tent service of from 17 to 20 hours. The same 1 cells, after adding the improvement embodied in this invention, gave an intermittent serviceof from 24 to 27 hours. Similar results were obtained in experiments with the better type of enveloped in a 5 sack of woven material. A 2.

Identical experiments with No. 6 type dry cells, both with and without the sacks, proved that the addition of the improvement of this invention extended'the life of the cells by. an average .of

- forty percent.

' cost per unit cellis insigniflcantlytsm'all.

Experiments were also performed by using a solid zinc disk in place of the powdered zinc, and the-results showed some extension of the lifeof the cell, but not nearly equal to that obtained with the powdered zinc. Examination of the solid zinc discs after completion of the experiments with ,same, showed that the discs were very slightly attacked after the cells were dead. It appears that the powdered zinc is much more readily and thoroughly attacked. ,it was also noted that, with the powdered zinc, the cell recovered more rapidly after turning oil the current, than in the case of the standard cells or those provided with the solid zinc 30 Having thus described the invention and set forth the advantages presented thereby, what is n claimed is as follows. i

I claim:

i In a dry cell, a 'zinc cup anode, a cathode con- I tained within said cup, a; bibulous disk disposed at the bottom of the cathode and conformable with the walls of the anode, spaced layers of excitant jelly cne adhering to the bottom of the bibulous disk and theother adhering to the bot 40 tom of the zinc cup, and a layer of granulated zinc filling the space between and contacting with mai izmrinm. 

